/* vi: set sw=4 ts=4: */ /* * * dmesg - display/control kernel ring buffer. * * Copyright 2006 Rob Landley <rob@landley.net> * Copyright 2006 Bernhard Reutner-Fischer <rep.nop@aon.at> * * Licensed under GPLv2, see file LICENSE in this tarball for details. */ #include <sys/klog.h> #include "libbb.h" int dmesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int dmesg_main(int argc UNUSED_PARAM, char **argv) { int len; char *buf; char *size, *level; unsigned flags = getopt32(argv, "cs:n:", &size, &level); enum { OPT_c = 1<<0, OPT_s = 1<<1, OPT_n = 1<<2 }; if (flags & OPT_n) { if (klogctl(8, NULL, xatoul_range(level, 0, 10))) bb_perror_msg_and_die("klogctl"); return EXIT_SUCCESS; } len = (flags & OPT_s) ? xatoul_range(size, 2, INT_MAX) : 16384; buf = xmalloc(len); len = klogctl(3 + (flags & OPT_c), buf, len); if (len < 0) bb_perror_msg_and_die("klogctl"); if (len == 0) return EXIT_SUCCESS; /* Skip <#> at the start of lines, and make sure we end with a newline. */ if (ENABLE_FEATURE_DMESG_PRETTY) { int last = '\n'; int in = 0; do { if (last == '\n' && buf[in] == '<') in += 3; else { last = buf[in++]; bb_putchar(last); } } while (in < len); if (last != '\n') bb_putchar('\n'); } else { full_write(STDOUT_FILENO, buf, len); if (buf[len-1] != '\n') bb_putchar('\n'); } if (ENABLE_FEATURE_CLEAN_UP) free(buf); return EXIT_SUCCESS; }